Re: problem - maybe due to 3Com Wireless DSL router?
- From: "Roger Mills" <watt.tyler@xxxxxxxxxxxxxx>
- Date: Sat, 17 Oct 2009 15:19:09 +0100
In an earlier contribution to this discussion,
Duncan Di Saudelli <not@xxxxxxxx> wrote:
Hello
Question: Why does one of my PCs load web pages flawlessly whereas
the other one, all of a sudden, doesn't?
Background: My router, via NAT, serves two computers. The two
computers run Windows XP and connect via Wi-Fi to the router. The
router serves out IP addresses to the two computers via DHCP. The
firewall in the router is enables and it stops ICMP amongst other
things.
The router is a 3Com officeconnect and, up until a couple of days ago
when I installed Mozilla thunderbird, all was well.
Now, however, all is not well. Dowstairs PC continues to work
flawlessly as ever. Upstairs PC will sometimes load webpages,
sometimes will refuse to load the same webpage, or will partially
load a page minus the images. This is the case with the 3Com's
firewll enabled.
If I disable the router firewall, the downstairs PC continues to work
flawleslly and now, so does the upstairs PC.
On the upstairs PC, disabling Windows firewall and also Zonealarm and
confirming that no ZA services are running results in the same
situation as having the whole lot running - web pages load properly
if teh router firewall is "off", and don't load properly if the
router firewall is "on".
(For reference, the downstairs PC has the Windows Firewall enabled,
but no other firewall software).
So, having checked the router firewall rules, there isn't anything
that I can see singles out the upstairs from the downstairs PC.
I've uninstalled Thunderbird - I think that the installation being
cnincident withthese problems is a red herring but I'm not an expert
- and the upstairs PC still fails to load web pages correctly.
The problem persists in IE7 and in firefox - I have checked the
settings in both, disabled add-ons i firefox, done a variety of tests
and can't ID the cause of the problem. No malware that I can find
(spybot S&D, WMSRT,SAS), all my IPCONFIG settings look right, I can
ping anything from either machine...
Can anyone suggest where I might need to look please?
DDS
It's a mystery! I don't know the answer - but if you find it, please let me
know because I've got more or less the same problem.
We have 2 PCs, both running Win XP SP2, and both hard wired to the same sort
of 3Com router as yours. Some while ago - maybe a couple of years - my spam
screening program (Mailwasher) plus my Outlook email client suddenly stopped
working on my PC. The only way I could get them to work was to turn off the
router's firewall - and it has remained off ever since.
I've just turned it on again and - with it on - Mailwasher etc. no longer
work, just as before. *However*, I've just tried Mailwasher on my wife's
computer while the firewall was on and - blow me - it works ok! So I presume
that there must be some subtle difference somewhere in the network settings
between our two computers, but I've no idea what. I wonder if there's a clue
in your reference to Firebird? I run Mozilla Firefox as my default browser,
whereas my wife only uses IE, and Firefox isn't installed on her PC.
--
Cheers,
Roger
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